From e4483eca01b48b943cd0461e24a74ae1a3139ed4 Mon Sep 17 00:00:00 2001
From: Nicolas James <Eele1Ephe7uZahRie@tutanota.com>
Date: Wed, 12 Feb 2025 21:57:46 +1100
Subject: Update to most recent version (old initial commit)

---
 src/client/entity/moveable.cc | 86 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 src/client/entity/moveable.cc

(limited to 'src/client/entity/moveable.cc')

diff --git a/src/client/entity/moveable.cc b/src/client/entity/moveable.cc
new file mode 100644
index 0000000..480e6db
--- /dev/null
+++ b/src/client/entity/moveable.cc
@@ -0,0 +1,86 @@
+#include "client/entity/moveable.hh"
+
+namespace client {
+
+static auto find_sequence_it(auto& updates,
+                             const shared::tick_t& sequence) noexcept {
+    return std::ranges::find_if(updates, [&sequence](const auto& update) {
+        return update.tick_sequence == sequence;
+    });
+}
+
+void moveable::repredict_from(const shared::tick_t& sequence) noexcept {
+    // find the animate update we want to repredict starting from
+    const auto find_it = find_sequence_it(this->updates, sequence);
+    if (find_it == std::end(this->updates)) {
+        return;
+    }
+
+    // backup current animate
+    const shared::animate before_move = *this;
+
+    // predict the next ticks starting from find_it until we run
+    // out of prediction history
+    for (auto it = find_it; it != std::end(this->updates); ++it) {
+        const auto next_it = std::next(it);
+        if (next_it == std::end(this->updates)) {
+            break;
+        }
+
+        const auto viewangles = next_it->animate.get_angles();
+        const auto commands = next_it->animate.get_commands();
+
+        this->shared::animate::operator=(it->animate);
+        this->commands = commands;
+        this->viewangles = viewangles;
+        const auto predicted = movement::move(*this, state::chunks);
+        if (!predicted.has_value()) {
+            break;
+        }
+        next_it->animate = *predicted;
+        next_it->animate.get_mutable_angles() = viewangles;
+        next_it->animate.get_mutable_commands() = commands;
+    }
+    // restore current animate
+    this->shared::animate::operator=(before_move);
+}
+
+void moveable::notify(const shared::animate& animate,
+                      const shared::tick_t& sequence,
+                      const bool from_server) noexcept {
+    this->animate::notify(animate, sequence, from_server);
+
+    if (!from_server) { // Only repredict if we're from the server.
+        return;
+    }
+    this->repredict_from(sequence);
+}
+
+void moveable::extrapolate() noexcept {
+    // can't extrapolate if no data
+    if (this->updates.empty()) {
+        return;
+    }
+
+    const auto& latest_it = std::rbegin(this->updates);
+    if (latest_it == std::rend(this->updates)) {
+        return;
+    }
+
+    // backup current animate, load latest animate
+    const shared::animate before_extrapolate = *this;
+    this->shared::animate::operator=(latest_it->animate);
+
+    // FIXED: we were writing our commands with the old commands, so we were
+    // always predicting the first commands, which were always for not moving!
+    this->commands = before_extrapolate.get_commands();
+    this->viewangles = before_extrapolate.get_angles();
+
+    const auto predicted = movement::move(*this, state::chunks);
+    if (predicted.has_value()) {
+        this->notify(*predicted, this->get_latest_sequence() + 1, false);
+    }
+    this->shared::animate::operator=(before_extrapolate);
+}
+
+} // namespace client
-- 
cgit v1.2.3